Azido and dimethylamino derivatives of tellurium hexafluoride

Abstract

It has been established by ¹⁹F NMR spectroscopy that TeF₆ and Me₃SiX (X = N₃ or NMe₂) react to form compounds TeF_nX_{6 –n}(n= 1–5). Reaction of TeF₆ with Me₃SiNMe₂ in a 1 : 2 ratio gave a mixture of TeF₅(NMe₂), cis-TeF₄(NMe₂)₂ and fac-TeF₃(NMe₂)₃. With a 1 : 4 ratio, TeF₄(NMe₂)₂(both isomers), TeF₂(NMe₂)₄(both isomers) and TeF(NMe₂)₅ were obtained. Reaction of TeF₆ with Me₃SiN₃ in a 1 : 1 ratio gave TeF₅(N₃) and cis-TeF₄(N₃)₂ as the major components with minute quantities of trans-TeF₄(N₃)₂ and fac-TeF₃(N₃)₃. A 1 : 2 reaction initially led to all members of the series except mer-TeF₃(N₃)₃, with TeF₅(N₃) and trans-TeF₄(N₃)₂ gradually disappearing. An unidentified tellurium(IV) species appeared in both of the azide reactions and often obscured the signal due to cis-TeF₂(N₃)₄. With azide ion, TeF₆ gave [TeF₅]^–, [TeF₇]^– and nitrogen.